i followed the links provided by hanna below and found this:
Making and Using 3% Solutions of H202
A 3% solution can be made quite easily by first pouring 1 ounce of 35% H202 into a pint jar. To this add 11 ounces of distilled water. This will make 12 ounces of 3% H202. 3% H202 has a variety of medicinal uses.
Three tablespoons mixed with a quart of non-chlorinated water makes a good enema or douche formula.
It can be used full strength as a mouthwash or mixed with baking soda for toothpaste.
It can be used full strength as a foot bath for athlete´s foot. (Diabetics have found relief from circulation problems by soaking their feet in 1 pint of 3% peroxide mixed with 1 gallon of warm, non-chlorinated water for 30 minutes nightly.)
A tablespoon added to 1 cup of non-chlorinated water can be used as a nasal spray. Depending on the degree of sinus involvement, one will have to adjust the amount of peroxide used. I have seen some who can use it at the full 3% strength and others who had difficulty with using a few drops and mixed with a cup of water.
3% H202 can be added to pets drinking water at the rate of 1 ounce per quart of non-chlorinated water. Sick cattle reportedly benefit from 1 pint (of 3%) to each 5 gallons of water. (Chickens and cows have remained healthy by using 8 ounces of 35% H202 per 1,000 gallons of drinking water.)